JP3903574B2 - Assembly jig for ball spline engaging part of toroidal type continuously variable transmission - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an assembly jig for a ball spline engaging portion of a toroidal-type continuously variable transmission used as a transmission for an automobile, for example.
[0002]
[Prior art]
For example, a toroidal continuously variable transmission used as a transmission for an automobile includes an input / output disk opposed to each other, a power roller provided between the input / output disks, and a loading cam that presses the input disk toward the output disk. Mechanism.
[0003]
The input disk is attached to an input shaft that is rotationally driven by a drive source so as to rotate in conjunction with the input shaft. The output disk is provided so as to rotate in conjunction with an output shaft that extracts power based on the rotation of the input shaft.
[0004]
The power roller is provided so as to be capable of rolling contact with the input / output disk and tilting between the input / output disks. The loading cam mechanism includes, for example, a disk-shaped cam disk attached to the input shaft.
[0005]
At least one of the input / output disc and the cam disc is movable along the axial direction of the shaft to which each is attached. This movable disk is attached to each shaft by a ball spline engaging portion described later.
[0006]
The ball spline engaging portion is provided between the disk and the respective shafts, and is a ball as a rolling element that can roll along the axial direction of the shaft, and a first provided on the outer peripheral surface of the shaft. 1 engagement groove and a second engagement groove provided on a surface opposite to the axis of the disk, and the first engagement groove and the second engagement groove are opposed to each other. The ball is inserted. The first engagement groove and the second engagement groove are formed along the outer shape of the ball when facing each other.
[0007]
When assembling the above-described ball spline engaging portion, conventionally, first, a lubricant such as grease is applied to the first engaging groove provided on the outer peripheral surface of the shaft. The ball is held in the first engagement groove by the adhesive force of the lubricant, and the shaft in this state is inserted into the disk. Further, the shaft and the disk are assembled by inserting the balls one by one by hand into the engagement grooves with the engagement grooves facing each other.
[0008]
[Problems to be solved by the invention]
As described above, when the ball is assembled while holding the ball in the first engagement groove by the adhesive force of the lubricant, the portion other than the second engagement groove of the disk hits the ball during the assembly operation. May fall from the first engaging groove or the like. For this reason, the assembly of the ball spline engaging portion cannot be easily performed.
[0009]
In addition, it is difficult to insert a ball into a desired engagement groove by assembling the balls one by one into the engagement groove by the operator's hand, and visually confirm the number of balls in the engagement groove. Since it is difficult to confirm, there is a possibility that the balls in the engagement groove are excessive or insufficient. For this reason, the mechanical strength of the toroidal continuously variable transmission may be reduced.
[0010]
The present invention has been made paying attention to the above circumstances, and its object is to provide a ball spline engaging portion of a toroidal continuously variable transmission that can easily insert a rolling element such as a ball into the engaging groove without excess or deficiency. An assembly jig is provided.
[0011]
[Means for Solving the Problems]
In order to solve the above-mentioned problems and achieve the object, the assembly jig of the ball spline engaging portion of the toroidal-type continuously variable transmission according to claim 1 is interlocked with an input shaft that is rotationally driven by a drive source. An input disk that rotates, an output disk that rotates in conjunction with an output shaft that extracts power based on the rotation of the input shaft, and a disc-shaped cam disk that is attached to one of the input and output shafts. And a loading cam mechanism for pressing at least one of the input / output disks in a direction in which the input / output disks are brought closer to each other, wherein at least one of the input / output disks and the cam disk is respectively formed by a ball spline engaging portion. The ball spline engaging portion is attached to the shaft of the rolling element, and the ball spline engaging portion is rotatable along the axial direction of the shaft. A first engagement groove provided on the surface, and a second engagement groove provided on a surface opposite to each axis of at least one of the input / output disk and the cam disk and facing and opposing the first engagement groove. In the toroidal continuously variable transmission, the ball spline engaging portion, wherein the rolling element is inserted into the first engaging groove and the second engaging groove facing each other. And a guide means for guiding the number of rolling elements inserted into the engagement groove to the first engagement groove and the second engagement groove that face each other. and the jig main body, wherein the first engaging groove and a state where the second engaging groove is opposed consistent, complete before the disk mounted by the ball spline engaging portion of the input and output disks and the cam disc The disc is attached to the output shaft. A groove alignment member for positioning the shaft from each other, and a stopper means capable release the holding holds the rolling element to the guide means of the jig body, the guide means, the rolling element rolling It is movable and has an opening that opens upward, and the bottom surface gradually inclines toward the first engagement groove and the second engagement groove, which face each other. A guide groove having a size on which the number of rolling elements inserted into the engagement groove can be placed, and the first engagement groove having a size that allows the rolling element to roll freely and facing each other in the guide groove. And a guide hole that penetrates through the end portion on the second engagement groove side, the first engagement groove that is oppositely matched, and a position opposite to the second engagement groove. It is said.
[0013]
The assembly jig for the ball spline engaging portion of the toroidal-type continuously variable transmission according to the second aspect of the present invention is the assembly jig according to the first aspect , wherein the assembly jig is held by the guide means of the jig body. A fall prevention means for preventing the moving body from falling is provided.
[0014]
In the assembly jig according to the first aspect, the groove aligning member positions the disk and the shaft in a state in which the engaging grooves face each other . Further, the bottom surface of the guide groove has a size capable of mounting the number of rolling elements inserted into the first and second engagement grooves. Furthermore, the guide groove has an opening. For this reason, the rolling element is held in the guide groove without excess or deficiency, and if the rolling element is excessive or insufficient, the excess or deficiency is visually confirmed through the opening of the groove. Further, stopper means capable of holding the rolling element and releasing the holding are provided, and the bottom surface of the guide groove is inclined. For this reason, the rolling element is inserted into the first and second engaging grooves along the bottom surface only by releasing the stopper means .
[0016]
In the assembly jig according to claim 2 , the fall prevention means prevents a rolling element held by the jig main body from dropping from the jig main body, so that a desired number of rolling elements are further provided in the engagement groove. Can be inserted reliably.
[0017]
DETAILED DESCRIPTION OF THE INVENTION
[0018]
DETAILED DESCRIPTION OF THE INVENTION
An embodiment of the present invention will be described below with reference to FIGS.
As shown in FIG. 1, a double-cavity toroidal continuously variable transmission 1 as a toroidal continuously variable transmission is configured to output power based on the rotation of an input shaft 7 that is rotationally driven by a drive source (not shown). 16 is a device that takes out to the output shaft through 16 or the like.
[0019]
The toroidal continuously variable transmission 1 includes a variator 2 and a loading cam mechanism 3. The variator 2 includes a pair of input disks 4 a and 4 b, a pair of output disks 5 a and 5 b, and a plurality of power rollers 6.
[0020]
The input disks 4a and 4b are spaced apart from each other and are provided facing each other. The input disks 4a and 4b are provided to rotate in conjunction with the input shaft 7, respectively. The input disks 4a and 4b are attached to the input shaft 7 by ball spline engaging portions 8a and 8b, respectively.
[0021]
Since the ball spline engaging portions 8a and 8b to which the input disks 4a and 4b are attached to the input shaft 7 have substantially the same configuration, the ball spline engaging portion 8a to which one input disk 4a is attached is representative. Will be described below.
[0022]
The ball spline engaging portion 8a is configured to freely roll along the axis P of the input shaft 7 and a plurality of balls 9 as rolling elements provided along the axis P between the input disk 4a and the input shaft 7. The first engaging groove 10 provided on the outer peripheral surface of the input shaft 7 and the second engaging groove 11 provided on the surface facing the input shaft 7 of the input disk 4a are provided.
[0023]
The first and second engagement grooves 10 and 11 are formed so as to follow the outer shape of the ball 9 when they face each other and can be inserted into the ball 9. The ball spline engaging portion 8a is configured to attach the input disk 4a to the input shaft 7 by inserting the ball 9 into the first and second engaging grooves 10 and 11 which are opposed to each other.
[0024]
In the illustrated example, the ball spline engaging portion 8 a includes three balls 9 along the axis P, and six engaging grooves 10 that are substantially equally spaced in the circumferential direction of the input shaft 7. , 11 are provided. The other ball spline engaging portion 8b is provided with four balls 9 along the axis P in the illustrated example.
[0025]
The input disk 4a is rotatable in conjunction with the input shaft 7 by the ball spline engaging portion 8a including the ball 9, the first and second engaging grooves 10 and 11, and the axis P It becomes movable along.
[0026]
The output disks 5a and 5b are provided between the pair of input disks 4a and 4b so as to face the input disks 4a and 4b, respectively, and to be loosely fitted to the input shaft 7. The output disks 5a and 5b are arranged coaxially with each other and rotate in synchronization with each other.
[0027]
The output disks 5a and 5b are provided so as to interlock with the output gear 16 arranged coaxially with the output disks 5a and 5b. The output gear 16 rotates in conjunction with an output shaft that extracts power based on the rotation of the input shaft 7.
[0028]
The plurality of power rollers 6 are supported between the input disks 4a and 4b and the output disks 5a and 5b, respectively, so as to be swingable around the pivot shaft 12, and output from the input disks 4a and 4b. A power roller inner ring 13 is provided which can freely contact the disks 5a and 5b.
[0029]
The loading cam mechanism 3 is provided on the back side of one input disk 4a. The loading cam mechanism 3 includes a disk-shaped cam disk 14 and a roller 15. The roller 15 is rotatable around an intersecting axis Q such as orthogonal to the axis P. The loading cam mechanism 3 is configured to press the input disks 4a and 4b toward the output disks 5a and 5b as the roller 15 rotates about the axis Q.
[0030]
With the above-described configuration, the variator 2 of the toroidal-type continuously variable transmission 1 has the rotational drive transmitted from the input shaft 7 by the loading cam mechanism 3 pressing the input disks 4a and 4b toward the output disks 5a and 5b. The force is transmitted to the output shaft via the input disks 4a and 4b, the power roller inner ring 13, the output disks 5a and 5b, and the output gear 16.
[0031]
The above-described second engagement groove 11 of the input disk 4a and the first engagement groove 10 of the input shaft 7 are made to face each other, and the balls 9 are inserted into these engagement grooves 10 and 11 to thereby form a ball spline. When the engaging portion 8a is assembled and the input disk 4a is assembled to the input shaft 7, an assembly jig 20 of the ball spline engaging portion 8a as shown in FIG. 2 is used.
[0032]
The assembly jig 20 of the ball spline engaging portion 8a includes a jig body 21, a stopper member 22, a groove alignment pin 23 as a groove alignment member, and a ring member 24 as a fall prevention means. The jig body 21 is formed in an annular shape having a central hole 25 having an inner diameter substantially equal to the outer diameter of the input shaft 7. The input shaft 7 can be freely inserted into the central hole 25.
[0033]
The jig body 21 is provided with the same number of guide portions 26 as guide means as the first and second engaging grooves 10 and 11 at equal intervals in the circumferential direction. Each guide part 26 is integrally provided with a guide groove 27 and a guide hole 28.
[0034]
The guide groove 27 is formed in a groove that allows the ball 9 to roll, and when the input shaft 7 is inserted into the central hole 25 and the jig body 21 is attached to the input shaft 7, An opening is formed in a surface 29 located on the opposite side of the input disk 4a, and the jig body 21 is formed to extend from the outer peripheral surface toward the inner peripheral side.
[0035]
The guide groove 27 is formed so as to be inclined so that its bottom surface 27a gradually approaches the input disk 4a from the outer peripheral surface of the jig body 21 toward the inner peripheral side. The bottom surface 27a of the guide groove 27 is formed in a size that allows the number of balls 9 to be inserted into the engagement grooves 10 and 11 of one ball spline engagement portion 8a to be placed thereon.
[0036]
The guide hole 28 is formed in a hole of a size that allows the ball 9 to roll, and the end 27 b on the inner peripheral side of the guide groove 27 and the jig body 21 on the input shaft 7 as described above. When attached, it penetrates over the position facing the engaging grooves 10 and 11. With the above-described configuration, the guide portion 26 guides the ball 9 placed on the bottom surface 27 a of the guide groove 27 to the engagement grooves 10 and 11.
[0037]
The stopper member 22 has a central hole 30 having an inner diameter substantially equal to the outer diameter of the input shaft 7 and is formed in an annular shape having an outer diameter smaller than the outer diameter of the jig body 21. The input shaft 7 can be freely inserted into the central hole 30.
[0038]
The stopper member 22 is configured to be attached to the input shaft 7 together with the jig body 21 by inserting the input shaft 7 with the jig body 21 attached thereto into the center hole 30 thereof. At this time, the stopper member 22 extends toward at least one of the guide holes 28 and penetrates the surface located on the opposite side of the input disk 4 a and the surface facing the jig body 21. The groove alignment pin insertion hole 31 is provided.
[0039]
The stopper member 22 is provided with a stopper pin 32 at a position facing the guide portion 26 other than the groove alignment pin insertion hole 31 is provided. When the stopper member 22 is attached to the input shaft 7, the stopper pin 32 faces the guide groove 27 from the surface facing the jig body 21 so that the tip of the stopper pin 32 contacts the bottom surface 27 a of the guide groove 27. Protrusively formed.
[0040]
The stopper pin 32 comes into contact with the bottom surface 27a of the guide groove 27 and temporarily holds the ball 9 placed in the guide groove 27 on the bottom surface 27a. The stopper member 22 and the jig body 21 are formed so that the difference in outer diameter between them can be inserted into the guide groove 27 when the stopper member 22 and the jig body 21 are attached to the input shaft 7.
[0041]
The groove alignment pin 23 is formed in a bar shape that can be inserted into the groove alignment pin insertion hole 31. When the groove aligning pin 23 is inserted into the groove aligning pin insertion hole 31, the tip of the groove aligning pin 23 passes through the guide hole 28 from the end surface 21 a facing the input disk 4 a of the jig body 21, and the engaging groove 10. , 11 side. At this time, the tip end portion of the groove alignment pin 23 is inserted into the engagement grooves 10 and 11, and the input disk 4a and the input shaft 7 are positioned in a state where the engagement grooves 10 and 11 face each other, and the guide groove 27 The ball 9 placed on the bottom surface 27a is temporarily held on the bottom surface 27a.
[0042]
The ring member 24 is formed in an annular shape having an inner diameter substantially equal to the outer diameter of the jig body 21, and the thickness thereof is larger than the thickness of the jig body 21.
[0043]
When the ring member 24 is attached to the input shaft 7 together with the jig main body 21 or the like, the jig 24 is used to fix the jig 24 or the like so that the end face 24a facing the input disk 4a is located on the same plane as the end face 21a. It is fixed to the main body 21. At this time, the end surface 24b of the ring member 24 opposite to the input disk 4a protrudes from the surface 29 of the jig body 21, so that the ring member 24 prevents the ball 9 from dropping from the jig body 21. It will be.
[0044]
According to the configuration described above, when assembling the ball spline engaging portion 8a, first, the input disk 4a is inserted into the input disk 4a by inserting the input shaft 7 to which the loading cam mechanism 3 is attached. Place at the position.
[0045]
At this time, the jig main body 21 and the ring member 24 are fixed in a state where the end faces 21a and 24a are positioned on the same plane. Then, the input shaft 7 is inserted into the central hole 25 and the jig body 21 is attached to the input shaft 7. Further, the input shaft 7 is inserted into the central hole 30 and the stopper member 22 is attached to the input shaft 7. At this time, the stopper pin 32 of the stopper member 22 is inserted into the guide groove 27 of the guide portion 26 so that the tip thereof is in contact with the bottom surface 27a.
[0046]
Thereafter, the groove aligning pin 23 is inserted into the groove aligning pin insertion hole 31, and the jig body 21 and the input disk 4a are rotated around the axis P of the input shaft 7 while pressing the pin 23 toward the input disk 4a. Rotate. Then, when the engagement grooves 10 and 11 described above are opposed to each other, the tip of the groove alignment pin 23 enters the engagement grooves 10 and 11, and the input shaft 7, the input disk 4a, and the jig main body 21. Are positioned between each other.
[0047]
The same number of balls 9 as the number inserted in the engaging grooves 10 and 11 is placed on the bottom surface 27 a of each guide groove 27. Then, the stopper member 22 and the groove alignment pin 23 are moved away from the jig body 21 and removed from the input shaft 7. Then, the stopper pin 32 and the groove alignment pin 23 of the stopper member 22 are not held, and the ball 9 placed on the bottom surface 27a of the guide groove 27 is inserted into the engagement grooves 10 and 11.
[0048]
After the ball 9 is inserted into the engaging grooves 10 and 11, the jig main body 21 and the like are moved away from the input disk 4a, removed from the input shaft 7, and the above-described ball spline engaging portion 8a is assembled. finish.
[0049]
According to the present embodiment, the groove alignment pin 23 positions the input shaft 7 and the input disk 4a in a state where the engaging grooves 10 and 11 face each other, and guide grooves in the guide portion 26 of the jig body 21. 27, a desired number of balls 9 to be inserted into the engagement grooves 10 and 11 are placed, and the guide portion 26 guides the balls 9 to the engagement grooves 10 and 11, so that the engagement grooves A desired number of balls 9 can be inserted into 10 and 11 reliably.
[0050]
Further, the stopper member 22 and the groove aligning pin 23 hold the ball 9 on the bottom surface 27a of the guide groove 27 of the guide portion 26 of the jig main body 21, and the input disk gradually increases as the bottom surface 27a moves toward the inner peripheral side. Since it is inclined in the direction approaching 4a, it is possible to reliably insert the desired number of balls 9 into the engaging grooves 10 and 11 by releasing the holding of the balls 9 of the stopper member 22 and the groove aligning pin 23. it can.
[0051]
Further, when releasing the holding of the ball 9 of the stopper member 22 and the groove aligning pin 23, the stopper member 22 and the groove aligning pin 23 are moved away from the input disk 4a and simply removed from the input shaft 7. Therefore, the ball 9 can be easily inserted into the engaging grooves 10 and 11.
[0052]
Since the ring member 24 prevents the ball 9 held by the guide portion 26 of the jig main body 21 from dropping, the desired number of balls 9 can be more reliably inserted into the engagement grooves 10 and 11.
[0053]
Therefore, the ball 9 can be easily inserted into the engagement grooves 10 and 11 without excess or deficiency to assemble the ball spline engagement portion 8a, and the mechanical strength of the toroidal continuously variable transmission 1 can be reduced. Absent.
[0054]
The above is a description of the ball spline engaging portion 8a between the one input disk 4a and the input shaft 7 shown in FIG. The ball spline engaging part 8b between the other input disk 4b and the input shaft 7 or the ball spline engaging part provided between the output disk 4 and the shaft supporting the output disk 4 is not limited to this. Alternatively, the present invention can also be applied to an assembly jig for assembling a ball spline engaging portion provided between the cam disk 14 of the loading cam mechanism 3 and a shaft that supports the cam disk 14. It is desirable that a maximum of four balls 9 can be placed in the guide groove 27 of the assembly jig 20 for assembling the other ball spline engaging portion 8b.
[0055]
【The invention's effect】
According to the first aspect of the present invention, the groove aligning member is positioned in a state where the engagement grooves between the disk and the shaft face each other and the guide means of the jig body is inserted into these engagement grooves. Since the rolling elements are guided, a desired number of rolling elements can be inserted into the engaging grooves. Therefore, the rolling elements can be reliably inserted into the engagement groove without excess or deficiency, and the mechanical strength of the toroidal continuously variable transmission is not reduced. Further, since the number of rolling elements to be inserted into the engaging groove is once held by the guide means, a desired number of rolling elements can be easily and more easily inserted into the engaging groove by releasing the holding of the rolling element of the stopper member. Can be inserted reliably. Therefore, the rolling elements can be inserted into the engaging groove easily and more reliably without excess and deficiency, and the mechanical strength of the toroidal-type continuously variable transmission is less reduced.
[0057]
According to the second aspect of the present invention, the fall prevention means more reliably inserts the desired number of rolling elements into the engaging groove in order to prevent the rolling elements held by the jig body from dropping. Can do. Therefore, the rolling elements can be inserted into the engaging groove more reliably without excess and deficiency, and the mechanical strength of the toroidal continuously variable transmission is not further reduced.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view showing a part of a toroidal continuously variable transmission.
FIG. 2 is a cross-sectional view showing an embodiment of an assembly jig for a ball spline engaging portion of the toroidal continuously variable transmission according to the present invention.
[Explanation of symbols]
1 ... Double cavity type toroidal continuously variable transmission (toroidal continuously variable transmission)
3 ... loading cam mechanisms 4a, 4b ... input disks 5a, 5b ... output disks 7 ... input shafts 8a, 8b ... ball spline engaging portions 9 ... balls (rolling elements)
DESCRIPTION OF SYMBOLS 10 ... 1st engagement groove 11 ... 2nd engagement groove 14 ... Cam disk 20 ... Assembly jig | tool 21 ... Jig body 22 ... Stopper member 23 ... Groove alignment pin (groove alignment member)
24. Ring member (falling prevention means)
26 ... Guide part (guidance means)

Claims (2)

One of an input disk that rotates in conjunction with an input shaft that is driven to rotate by a drive source, an output disk that rotates in conjunction with an output shaft that extracts power based on the rotation of the input shaft, and the input / output shaft A loading cam mechanism that has a disk-shaped cam disk attached to the input / output disk and presses at least one of the input / output disks in a direction to bring the input / output disks closer to each other.
At least one of the input / output disk and the cam disk is attached to each shaft by a ball spline engaging portion,
The ball spline engaging portion includes a rolling element that can freely roll along an axial direction of the shaft, a first engaging groove provided on an outer peripheral surface of the shaft, and the input / output disk and the cam disk. A second engagement groove provided on a surface facing at least one of the respective shafts and facing and opposite to the first engagement groove, and the first engagement groove and the second oppositely matched. In the toroidal continuously variable transmission formed by inserting the rolling element into the engagement groove of
A jig used when assembling the ball spline engaging portion,
A jig body provided with guide means for guiding the number of rolling elements inserted into the engagement groove to the first engagement groove and the second engagement groove, which are opposed to each other;
Of the input / output disc and the cam disc, the disc mounted by the ball spline engaging portion and the input / output shaft in a state where the first engagement groove and the second engagement groove are opposed to each other. A groove alignment member for positioning the shaft on which the disk is mounted with each other;
Stopper means capable of holding the rolling element on the guide means of the jig body and releasing the holding;
With
The guiding means includes
The rolling element is capable of rolling and has an opening that opens upward, and gradually descends toward the first engagement groove and the second engagement groove whose bottom faces face each other. A guide groove having a size capable of placing a number of rolling elements inserted into the engagement groove,
The rolling element has a size that allows rolling, and the first engagement groove and the end of the second engagement groove that are opposed to each other in the guide groove are opposed to the first engagement groove. An assembly apparatus for a ball spline engaging portion of a toroidal-type continuously variable transmission , comprising a groove and a guide hole penetrating over a position facing the second engaging groove . 2. An assembly jig for a ball spline engaging portion of a toroidal continuously variable transmission according to claim 1, further comprising fall prevention means for preventing the rolling elements held by the guide means of the jig body from dropping. .

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